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Gel polymer energy storage lithium ion battery and preparation method thereof

A gel polymer, lithium-ion battery technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of reducing the quality of active materials, poor cycle performance, and no capacity, to improve specific energy, The effect of long cycle life and capacity improvement

Inactive Publication Date: 2014-03-26
深圳市迪凯特电池科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods have solved the problem of LiFePO 4 , LiMn 2 o 4 Cathode material and Li 4 Ti 5 o 12 The negative electrode material is compatible with the low voltage of the battery system, but the first method uses pure LiNi 0.5 mn 1.5 o 4 , there is a problem of fast capacity fading and poor cycle performance due to the dissolution of Mn when the material is in contact with the electrolyte. The second method uses AlPO 4 coated LiNi 0.5 mn 1.5 o 4 Although the cathode material solves the dissolution problem of Mn, AlPO 4 The coating provides no capacity and reduces the mass of the active material

Method used

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  • Gel polymer energy storage lithium ion battery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Positive electrode preparation: 95% of the surface is coated with LiFePO 4 LiNi 0.5 mn 1.5 o 4, 3% KS-6, and 2% PVDF were mixed in N-methylpyrrolidone (NMP) to form a slurry, uniformly coated on a 16 μm aluminum foil current collector, dried, compacted, and cut to obtain a positive electrode.

[0027] Negative electrode preparation: 93% Li 4 Ti 5 o 12 , 4% SFG-6, and 3% PVDF were mixed in N-methylpyrrolidone (NMP) to form a slurry, uniformly coated on a 10 μm copper foil current collector, dried, compacted, and cut to obtain the negative electrode.

[0028] Preparation of gel polymer separator: Dissolve polyvinylidene fluoride and hexafluoropropylene (PVDF-HFP) copolymer in acetone, add 20% nano-scale Al 2 o 3 Powder, mixed into a slurry, evenly coated on a 12 μm thick PE base film, with a thickness of 4 μm on one side, and dried to obtain a gel polymer separator.

[0029] Electrolyte preparation: Mix ethylene carbonate (EC), diethyl carbonate (DEC), and ethyl m...

Embodiment 2

[0032] Positive electrode preparation: 95% of the surface is coated with LiFePO 4 LiNi 0.5 mn 1.5 o 4 , 3% carbon nanotubes (CNTs), and 2% PVDF were mixed in N-methylpyrrolidone (NMP) to form a slurry, uniformly coated on a 16 μm aluminum foil current collector, dried, compacted, and cut to obtain positive electrode.

[0033] Negative electrode preparation: 93% Li 4 Ti 5 o 12 , 4% carbon nanotubes (CNTs), 3% PVDF mixed in N-methylpyrrolidone (NMP) to form a slurry, evenly coated on a 10μm copper foil current collector, dried, compacted, cut, get the negative pole.

[0034] Other steps are the same as in Example 1.

Embodiment 3

[0036] Positive electrode preparation: 95% of the surface is coated with LiFePO 4 LiNi 0.5 mn 1.5 o 4 , 3% KS-6, and 2% PVDF were mixed in N-methylpyrrolidone (NMP) to form a slurry, uniformly coated on a 16 μm aluminum foil current collector, dried, compacted, and cut to obtain a positive electrode.

[0037] Negative electrode preparation: 93% Li 4 Ti 5 o 12 , 4% SFG-6, 1% CMC, and 2% SBR were mixed in deionized water to form a slurry, uniformly coated on a 10 μm copper foil current collector, dried, compacted, and cut to obtain a negative electrode.

[0038] Other steps are the same as in Example 1.

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a gel polymer energy storage lithium ion battery and a preparation method thereof. The gel polymer energy storage lithium ion battery comprises a positive plate, a negative plate, a separation film, a bath solution and an aluminum plastic film housing, wherein the positive plate and the negative plate are wound by the separation film, and are placed in the bath solution; the aluminum plastic film housing is used for accommodating the positive plate, the negative plate, the separation film and the bath solution; in addition, (1) the cathode material of the positive plate is formed by a positive active material, an anode conductive agent and an anode binder; (2) the anode material of the negative plate is formed by a negative active material, a cathode conductive agent and a cathode binder; (3) the separation film is a gel polymer coating separation film. The lithium ion battery provided by the invention is long in cycle life, high in safety performance, high in specific energy and low in fabricating cost, and can be used for various energy storage devices.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a gel polymer energy storage lithium ion battery and a preparation method thereof. [0002] Background technique [0003] A lithium-ion battery is a rechargeable battery that primarily relies on the movement of lithium ions between the positive and negative electrodes to function. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes: when charging the battery, Li+ is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true when discharging. Lithium-ion battery is a representative of modern high-performance batteries. Since its industrialization in the 1990s, it has developed rapidly. Because of its advantages such as high voltage, large specific energy, long cycle life, saf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/505H01M4/525H01M10/058H01M4/1391
CPCY02E60/122H01M4/1391H01M4/1397H01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 褚相礼谢麟王栋王波秦莲芝
Owner 深圳市迪凯特电池科技有限公司
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